Bolt size:

Coefficients of edge/pitch distance:
Minimum values according to EN 1993-1-8:12/2006 (e1=1.2*d0, e2=1.2*d0, p1=2.2*d0, p2=2.4*d0)
Recommended values accordin to Prof. Macháček(*) (e1=2.5*d0, e2=2.0*d0, p1=3.5*d0, p2=3.5*d0)
Custom values Note:
(*)Prof. Josef Macháček (Faculty of Civil Engineering CTU in Prague)